Issues 507 and 514 adv login link and initial server

- Removes initial server prompt
- Adds "advanced login settings" link (calls the `setInitialServer` function from the removed prompt)
- Adds a "Learn more..." link to the login screen when the preliminary screen is disabled

Also includes a small change to the prelim screen: the "or" is no longer clickable with the "Need and Account..." CTA


Fixes #507 
Fixes #514